package com.example.demo;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class WuziqiPanel extends View {
    private int mPanelWidth;
    private float mLineHeight;
    private  int MAX_LINE=10;
    private int MAX_COUNT_IN_LINE=5;

    private Paint mPaint=new Paint();
    private Bitmap mWhitePiece;
    private Bitmap mBlackPiece;
    private float ratioPieceOfLineHeight=3*1.0f/4;

    private boolean mIsWhite=true;
    private ArrayList<Point> mwhiteArray=new ArrayList<>();
    private ArrayList<Point> mBlackArray=new ArrayList<>();

    private boolean mIsGameOver;
    protected boolean mIsWhiteWinner;


    public WuziqiPanel(Context context, AttributeSet attrs) {
        super(context, attrs);
        setBackgroundColor(0x44ff0000);
        init();
    }

    private void init() {
        mPaint.setColor(0x88000000);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);

        mWhitePiece= BitmapFactory.decodeResource(getResources(),R.drawable.stone_w2);
        mBlackPiece=BitmapFactory.decodeResource(getResources(),R.drawable.stone_b1);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int widthSize=MeasureSpec.getSize(widthMeasureSpec);
        int widthMode=MeasureSpec.getMode(widthMeasureSpec);

        int heightSize=MeasureSpec.getSize(heightMeasureSpec);
        int heigthMode=MeasureSpec.getMode(heightMeasureSpec);

        int width=Math.min(widthSize,heightSize);

        if(widthMode==MeasureSpec.UNSPECIFIED){
            width=heightSize;
        }else if(heigthMode==MeasureSpec.UNSPECIFIED){
            width=widthSize;
        }
        setMeasuredDimension(width,width);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawBoard(canvas);
        drawPieces(canvas);
        checkGameOver();
    }

    private void checkGameOver() {
        boolean whiteWin=checkFiveInLine(mwhiteArray);
        boolean blackWin=checkFiveInLine(mBlackArray);

        if(whiteWin||blackWin){
            mIsGameOver=true;
            mIsWhiteWinner=whiteWin;
            String text =mIsWhiteWinner?"白棋胜利":"黑棋胜利";
            Toast.makeText(getContext(),text,Toast.LENGTH_SHORT).show();
        }
    }

    private static final String INSTANCE="instance";
    private static final String INSTANCE_GAME_OVER="instance_game_over";
    private static final String INSTANCE_WHITE_ARRAY="instance_white_array";
    private static final String INSTANCE_BLACK_ARRAY="instance_black_array";
    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle=new Bundle();
        bundle.putParcelable(INSTANCE,super.onSaveInstanceState());
        bundle.putBoolean(INSTANCE_GAME_OVER,mIsGameOver);
        bundle.putParcelableArrayList(INSTANCE_WHITE_ARRAY,mwhiteArray);
        bundle.putParcelableArrayList(INSTANCE_BLACK_ARRAY,mBlackArray);
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if(state instanceof Bundle){
            Bundle bundle=(Bundle) state;
            mIsGameOver=bundle.getBoolean(INSTANCE_GAME_OVER);
            mwhiteArray=bundle.getParcelableArrayList(INSTANCE_WHITE_ARRAY);
            mBlackArray=bundle.getParcelableArrayList(INSTANCE_BLACK_ARRAY);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE));

            return;
        }
        super.onRestoreInstanceState(state);

    }

    public void start(){
        mwhiteArray.clear();
        mBlackArray.clear();
        mIsGameOver=false;
        mIsWhiteWinner=false;
        invalidate();
    }

    private boolean checkFiveInLine(List<Point> points) {
        for(Point p:points){
            int x=p.x;
            int y=p.y;

            boolean win=checkHorizontal(x,y,points);
            if(win)return  true;
            win=checkVetical(x,y,points);
            if(win)return  true;
            win=checkLeftDiagonal(x,y,points);
            if(win)return  true;
            win=checkRightDiagonal(x,y,points);
            if(win)return  true;

        }
        return  false;
    }

    private boolean checkHorizontal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;

        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y))){
                count++;
            }else {
                break;
            }
        }

        if(count==MAX_COUNT_IN_LINE) return true;

        return false;
    }
    private boolean checkVetical(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x,y-i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;

        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x,y+i))){
                count++;
            }else {
                break;
            }
        }

        if(count==MAX_COUNT_IN_LINE) return true;

        return false;
    }

    private boolean checkLeftDiagonal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y+i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;

        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y-i))){
                count++;
            }else {
                break;
            }
        }

        if(count==MAX_COUNT_IN_LINE) return true;

        return false;
    }
    private boolean checkRightDiagonal(int x, int y, List<Point> points) {
        int count=1;
        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x-i,y-i))){
                count++;
            }else {
                break;
            }
        }
        if(count==MAX_COUNT_IN_LINE) return true;

        for(int i=1;i<MAX_COUNT_IN_LINE;i++){
            if(points.contains(new Point(x+i,y+i))){
                count++;
            }else {
                break;
            }
        }

        if(count==MAX_COUNT_IN_LINE) return true;

        return false;
    }

    private void drawPieces(Canvas canvas) {
        for(int i=0;i<mwhiteArray.size();i++){
            Point whitePoint=mwhiteArray.get(i);
            canvas.drawBitmap(mWhitePiece,
                    (whitePoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    (whitePoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                    null
                    );
        }

        for(int i=0;i<mBlackArray.size();i++){
                Point blackPoint=mBlackArray.get(i);
                canvas.drawBitmap(mBlackPiece,
                        (blackPoint.x+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                        (blackPoint.y+(1-ratioPieceOfLineHeight)/2)*mLineHeight,
                        null
                );
            }
    }

    private void drawBoard(Canvas canvas) {
        int w=mPanelWidth;
        float lineHeight=mLineHeight;
        for(int i=0;i<MAX_LINE;i++){
            int startX= (int) (lineHeight/2);
            int endX= (int) (w-lineHeight/2);

            int y= (int) ((0.5+i)*lineHeight);
            canvas.drawLine(startX,y,endX,y,mPaint);
            canvas.drawLine(y,startX,y,endX,mPaint);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(mIsGameOver) return false;
        int action=event.getAction();
        if (action==MotionEvent.ACTION_UP){
            int x= (int) event.getX();
            int y= (int) event.getY();
            Point p=getValidPoint(x,y);
            if (mwhiteArray.contains(p)||mBlackArray.contains(p)){
                return  false;
            }
            if(mIsWhite){
                mwhiteArray.add(p);
            }else {
                mBlackArray.add(p);
            }
            invalidate();
            mIsWhite=! mIsWhite;
        }
        return true;
    }

    private Point getValidPoint(int x, int y) {
        return new Point((int)(x/mLineHeight),(int)(y/mLineHeight));
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mPanelWidth=w;
        mLineHeight=mPanelWidth*1.0f/MAX_LINE;

        int pieceWidth=(int) (mLineHeight*ratioPieceOfLineHeight);
        mWhitePiece=Bitmap.createScaledBitmap(mWhitePiece,pieceWidth,pieceWidth,false);
        mBlackPiece=Bitmap.createScaledBitmap(mBlackPiece,pieceWidth,pieceWidth,false);

    }
}
